the biggest difference between the republican plan and the president's remains taxes and how the government can generate more revenue to pay down the debt. >> rates have to rise on the top 2%. there's no other way to do it. >> reporter: president obama says his plan will raise taxes on the rich, bringing in $1.6 trillion. republicans want to close tax loopholes and eliminate deductions, which they say will raise $800 billion in new revenue. >> the president has a huge responsibility to work together with congress and find a solution to avert the fiscal cliff. >> reporter: and they say it's now up to the president to find a plan that can pass both chambers of congress. so now that each side has rejected the other's first offer, it's going to be interesting and important to watch the timing of the next offer on the part of the white house to really try to figure out, terrell, how far both sides are willing to take us toward that cliff. >> and which side has the edge at this point. susan mcginnis in washington this morning. thank you so much. >>> iran says this morning it's captured a united s